Tow limits

Thanks for the replies. Just to clarify the BT cruiser chasis tow rating max was 3500 and the class 2 hitch that is already on the rv has a rating of 3500. We are planning on increasing our hitch to a class 3 which gives that rating max at 5000# however the chasis max will still be 3500#. We want to go up to a class 3 hitch just to be on the safe side but I did not consider if this can cause any additional stress on the rv chasis?
We will be doing a lot of mountain towing and very curvy roads. Go on blue ridge pkway and smokies a lot. So far have been on mountain roads to Townsend and helen ga with no issues with power, not towing anything yet.
Thanks zigpep